Problems booting exynos5420 with >1 CPU

[Russell King - ARM Linux]

On Fri, Jun 06, 2014 at 01:49:11PM -0700, Doug Anderson wrote:
> This works and IMHO is much cleaner because it totally removes the
> U-Boot dependency.  I'll cleanup to not be so insane and post:
> 
> diff --git a/arch/arm/mach-exynos/mcpm-exynos.c
> b/arch/arm/mach-exynos/mcpm-exynos.c
> index 0498d0b..9c5df7b 100644
> --- a/arch/arm/mach-exynos/mcpm-exynos.c
> +++ b/arch/arm/mach-exynos/mcpm-exynos.c
> @@ -290,6 +290,14 @@ static void __naked
> exynos_pm_power_up_setup(unsigned int affinity_level)
>         "b      cci_enable_port_for_self");
>  }
> 
> +static void __naked exynos_mcpm_secondary_cpu_start(void)
> +{
> +       asm volatile ("\n"
> +       "ldr    r0, [pc, #0]\n"
> +       "bx     r0\n"
> +       ".word  0" );
> +}
> +

So does it matter whether the above code gets assembled as thumb or
ARM?  How does your caller know which ISA mode to enter this fragment
in?

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